Differences in collision induced dissociation of protonated molecules
T11N1
Differences in collision induced dissociation of protonated molecules
of isomeric alkyl phenols
A.I. Ukolov, I.G. Zenkevich
It is shown that isomeric ortho- and para-substituted alkyl phenols are characterized by significant differences in collision induced dissociation (CID) mass spectra of their protonated molecules formed at chemical ionization using methane as the gas reagent. Mass spectra of p-substituted isomers contain intense peaks of characteristic ions [M+H–H2O]+ which are absent in spectra of o-isomers. Such principal differences in CID mass spectra permit one to distinguish ortho-alkyl phenols from other isomers without using the MS reference data and/or chromatographic retention parameters.
